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by Total_Meltdown 4360 days ago
I have run into this at least twice this week alone with both Nginx and HAProxy pointing at Amazon Elastic Load Balancers. Amazon occasionally rotates out IPs for ELBs, so everything's working fine for weeks and then boom, now we're having a bad day.
1 comments
aalbertson 4358 days ago
As a rule, NEVER EVER use CNAME's within AWS on Route53. You should always use their A Alias function. This provides near instant changes when you need to adjust a record. This only works on aws resources, but it is a great feature they built in.
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Total_Meltdown 4357 days ago
I totally agree. In these two specific cases, R53 + ELB wasn't going to work for us though, because of reasons. (I don't think I can go into specifics, but they're actual reasons.) Our workaround was reloading the configs (which triggers a DNS cache flush on both Nginx[1] and HAproxy[2]) once every couple of minutes.

I know, I know, I hate it too. We're working on it. Just wanted to share the workaround.

[1] http://wiki.nginx.org/CommandLine#Loading_a_New_Configuratio...

[2] http://www.mgoff.in/2010/04/18/haproxy-reloading-your-config...

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